"use strict";

const path = require("path");
const fs = require("fs");
const url = require("url");

// Make sure any symlinks in the project folder are resolved:
// https://github.com/facebook/create-react-app/issues/637
const appDirectory = fs.realpathSync(process.cwd());
const resolveApp = relativePath => path.resolve(appDirectory, relativePath);

const envPublicUrl = process.env.PUBLIC_URL;

function ensureSlash(inputPath, needsSlash) {
	const hasSlash = inputPath.endsWith("/");
	if (hasSlash && !needsSlash) {
		return inputPath.substr(0, inputPath.length - 1);
	} else if (!hasSlash && needsSlash) {
		return `${inputPath}/`;
	} else {
		return inputPath;
	}
}

const getPublicUrl = appPackageJson => envPublicUrl || require(appPackageJson).homepage;

// We use `PUBLIC_URL` environment variable or "homepage" field to infer
// "public path" at which the app is served.
// Webpack needs to know it to put the right <script> hrefs into HTML even in
// single-page apps that may serve index.html for nested URLs like /todos/42.
// We can't use a relative path in HTML because we don't want to load something
// like /todos/42/static/js/bundle.7289d.js. We have to know the root.
function getServedPath(appPackageJson) {
	const publicUrl = getPublicUrl(appPackageJson);
	const servedUrl = envPublicUrl || (publicUrl ? url.parse(publicUrl).pathname : "/");
	return ensureSlash(servedUrl, true);
}

const moduleFileExtensions = ["web.mjs", "mjs", "web.js", "js", "web.ts", "ts", "web.tsx", "tsx", "json", "web.jsx", "jsx"];

// Resolve file paths in the same order as webpack
const resolveModule = (resolveFn, filePath) => {
	const extension = moduleFileExtensions.find(extension => fs.existsSync(resolveFn(`${filePath}.${extension}`)));

	if (extension) {
		return resolveFn(`${filePath}.${extension}`);
	}

	return resolveFn(`${filePath}.js`);
};

// config after eject: we're in ./config/
module.exports = {
	dotenv: resolveApp(".env"),
	appPath: resolveApp("."),
	appBuild: resolveApp("build"),
	appPublic: resolveApp("public"),

	appHtml: resolveApp("public/index.html"),
	appQueryHtml: resolveApp("public/query.html"),
	appTicketHtml: resolveApp("public/ticket.html"),
	appOrderHtml: resolveApp("public/order.html"),

	appIndexJs: resolveModule(resolveApp, "src/index/index"),
	appQueryJs: resolveModule(resolveApp, "src/query/index"),
	appTicketJs: resolveModule(resolveApp, "src/ticket/index"),
	appOrderJs: resolveModule(resolveApp, "src/order/index"),

	appPackageJson: resolveApp("package.json"),
	appSrc: resolveApp("src"),
	appTsConfig: resolveApp("tsconfig.json"),
	appJsConfig: resolveApp("jsconfig.json"),
	yarnLockFile: resolveApp("yarn.lock"),
	testsSetup: resolveModule(resolveApp, "src/setupTests"),
	proxySetup: resolveApp("src/setupProxy.js"),
	appNodeModules: resolveApp("node_modules"),
	publicUrl: getPublicUrl(resolveApp("package.json")),
	servedPath: getServedPath(resolveApp("package.json")),
};

module.exports.moduleFileExtensions = moduleFileExtensions;
